Chemical reactions accompanying absorption of nitric oxide into aqueous mixed solutions of iron(II)-EDTA and sodium sulfite

Abstract

The absorption of dilute NO into aqueous mixed solutions of Fe"-edta and Na, SO, was carried out by use of a semibatch bubble column at 308 K and 0.10 MPa total pressure. Chemical reactions accompanyin this chemical absor tion were investigated through quantitative determination of gasand liquid-phase species. Fe' was oxidized

Ligand Effects on the Kinetics of the Reversible Binding of NO to Selected Aminocarboxylato Complexes of Iron(II) in Aqueous Solution

“…This technique can be used to perturb changes in the equilibrium position for systems that exhibit a significant temperature dependence. For the observed relaxation kinetics, the first-order rate constant is given by 3.0 311 3.5 ϫ 10 6 [9] 3.0 328 8.6 ϫ 10 5 [9] 3.0 343 3.4 ϫ 10 5 [9] 1.5Ϫ2.5 298 (3.3 Ϯ 0.2) ϫ 10 7 [10] 7.0 298 (1.2 Ϯ 0.1) ϫ 10 8 [10] 9.5Ϫ10 298 (1.0 Ϯ 0.1) ϫ 10 8 [10] 5.1 298 Ͼ 6.0 ϫ 10 7 Ͼ 60 [2] 6.0Ϫ8.0 308 9.9 ϫ 10 6 [11] 2.5Ϫ11.0 298 9.4 ϫ 10 7 3.1 ϫ 10 6 [12] 7.0 298 1.2 ϫ 10 8 [13] 7.0 313 1.4 ϫ 10 8 [13] 7.0 333 1.4 ϫ 10 8 [13] 7.0 353 1.5 ϫ 10 8 [13] Ϫ 288 2.2 ϫ 10 6 [14] Ϫ 298 1.5 ϫ 10 6 [14] Ϫ 308 7.8 ϫ 10 5 [14] Ϫ 328 5.3 ϫ 10 5 [14] Ϫ 348 2.5 ϫ 10 5 [14] Ϫ 293 1.7 ϫ 10 6 [15] Ϫ 313 3.9 ϫ 10 5 [15] Ϫ 333 1.1 ϫ 10 5 [15] Fe II (dtpa) 5.0 298 (2.7 Ϯ 0.2) ϫ 10 5 Ͻ 23 Ϯ 11 Ͼ 1.2 ϫ 10 4 [5] Fe II (nta) Ϫ 295 5.9 ϫ 10 5 [16] Ϫ 313 3.0 ϫ 10 5 [16] Ϫ 333 1.0 ϫ 10 5 A fourth kinetic technique employed in this study is pulse radiolysis. The reaction of Fe II (L) with NO was studied by pulse-irradiation of aqueous solutions containing 2 m Fe III (L), 58Ϫ170 µ NO, 1  methanol, and either 2 m acetate or phosphate buffer.…”

Advanced separation technology for flue gas cleanup. Final report, February 1998

“…Initially, we tested our apparatus by duplicating experiments reported in the literature (Sada et al, 1984). Sada et al report the equilibrium constant K at 35°C for the reaction to be Fen@DTA)2-+ NOe = Fen (EDTA)(NO)2-2-29 …”

Kinetic study on regeneration of FeIIEDTA in the wet process of NO removal

“…Its obstacle lies in low solubility of NO in water. Some chemical reagents such as Fe II EDTA [7], NaClO 2 [8][9][10], etc. were added into this system to improve NO x absorption.…”

“…As a consequence, the regeneration of absorption solution becomes a fundamental part of this method. Various reducing agents such as polyphenolic compounds [12], Na 2 S 2 O 4 [13] and Na 2 SO 3 [7] have been tested. * Corresponding author.…”